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Tetracyanoethylene; high pressure; electrical resistivity; X-ray diffraction; phase transformation kinetics

This paper reports the phase transformation behaviour of tetracyanoethylene (TCNE) under pressure as revealed by AC electrical resistivity, its time evolution and X-ray diffraction studies. An irreversible transformation from monoclinic to cubic phase occurs at 2.1±0.1 GPa and is indicated by a sharp resistivity drop at this pressure. The time evolution of resistivity studies indicate that this transformation occurs via an intermediate phase having resistivity higher than either of the two crystalline phases. Finally, the kinetics of phase transformations obtained by time evolution of resistivity is compared with the X-ray studies on the pressure quenched TCNE.

P Ch Sahu¹ K Govinda Rajan¹ Mohammad Yousuf¹ R Mukhopadhyay^{1 2} S L Chaplot^{1 2} K R Rao^{1 2}

1. Indira Gandhi Centre for Atomic Research, Kalpakkam - 603 102, India
2. Bhabha Atomic Research Centre, Trombay, Bombay - 400 085, India

Published

December 1989

Manuscript received

10 April 1989